Turrets

Not to mention they targeting system rides the shortbus. Towers need to be punishing and harsh, there is no reason ever that a caster or ADC should be able to tank a tower unless they are building tanky and thereby shouldn't be doing as much damage as they can (with certain champs, which is a whole different problem with this game). The outer base turrets and nexus turrets in particular should be super deadly, at this point they may as well not be there at all, and the enemy team should be granted free gold for making it that far, because that is basically what is happening.